Electrical Supply
WARNING: Electrical shock hazard.
Turn OFF electric power at fuse box or service panel before making any electrical connections and ensure a proper ground connection is made before connecting line voltage.
All electrical connections and wiring MUST be installed by a qualified electrician and conform to the National Electrical Code and all local codes which have jurisdiction.
Failure to do so can result in property damage, personal injury and/or death.
Supply Circuit
The system cannot be expected to operate correctly unless the system is properly connected (wired) to an adequately sized single branch circuit. Check the installation manual and/or technical data for your particular unit and/or strip heaters to determine if the circuit is adequately sized.
Electrical Rating Tables
NOTE: Use copper conductors ONLY
Wire sizes are per NEC. Check local codes for overseas applications
A through D Suffix
Units Only | 250 V Receptacles and Fuse Types | |||||
AMPS | 15 |
| 20 * |
| 30 | |
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RECEPTACLE |
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MANUFACTURER |
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Hubbell | 5661 |
| 5461 |
| 9330 | |
P & S | 5661 |
| 5871 |
| 5930 | |
GE | ||||||
5661 |
| 5861 |
| 5700 | ||
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FUSE | 15 |
| 20 |
| 30 | |
(or HACR circuit breaker) |
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HACR — Heating, Air Conditioning, Refrigeration
* May be used for 15 Amp applications if fused for 15 Amp
Recommended branch circuit wire sizes*
Nameplate maximum circuit | AWG Wire size** | |
breaker size | ||
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15A | 14 | |
20A | 12 | |
30A | 10 |
AWG — American Wire Gauge * Single circuit from main box
** Based on copper wire, single insulated conductor at 60°C
Supply Voltage
To insure proper operation, supply voltage to the system should be within five (5) percent (plus or minus) of listed rating plate voltage.
Control (Low) Voltage
To insure proper system operation, the transformer secondary output must be maintained at a nominal 24 volts. The control (low) voltage transformer is equipped with multiple primary voltage taps. Connecting the primary, (supply) wire to the tap (i.e., 208 and 240 volts) that most closely matches the MEASURED supply voltage will insure proper transformer secondary output is maintained.
Supply Voltage
Supply voltage to the unit should be a nominal 208/230 volts. It must be between 197 volts and 253 volts. Supply voltage to the unit should be checked WITH THE UNIT IN OPERATION. Voltage readings outside the specified range can be expected to cause operating problems. Their cause MUST be investigated and corrected.
Electrical Ground
GROUNDING OF THE ELECTRICAL SUPPLY TO ALL UNITS IS REQUIRED for safety reasons.
Electrical Requirements
NOTE: | All field wiring must comply with |
| NEC and local codes. It is the |
| responsibility of the installer to |
| insure that the electrical codes are |
| met. |
Wire Size | Use ONLY wiring size recommended |
| for single outlet branch circuit. |
Fuse/Circuit | Use ONLY type and size fuse or |
| HACR circuit breaker |
Breaker | Indicated on unit's rating plate (See |
| sample on page 6). |
| Proper current protection to the unit |
| is the responsibility of the owner. |
Grounding | Unit MUST be grounded from branch |
| circuit to unit, or through separate |
| ground wire provided on permanently |
| connected units. Be sure that branch |
| circuit or general purpose outlet is |
| grounded. |
Wire Sizing | Use recommended wire size given in |
| the tables below and install a single |
| branch circuit. All wiring must comply |
| with local and national codes. NOTE: |
| Use copper conductors only. |
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